BRUSSELS — DS4-XO series of crystal oscillators from Maxim Integrated Products support frequency operation from 75 MHz to 622.08 MHz. The miniature crystal oscillators are available in a small, 5 mm x 3.2 mm package and provide jitter performance of less than 1psRMS (12 kHz to 20 MHz) over the -40 degrees Celsius to +85 degrees Celsius extended temperature range.
Manufactured using fundamental AT-cut crystal technology with no overtone, the DS4-XO series integrates a low-noise PLL-based oscillator designed in the company's own SiGe process. Fifty-five percent smaller than competitive solutions, the oscillatros are ideal for space-constrained designs used in Fibre Channel, Ethernet, 10G Ethernet, SONET/SDH, InfiniBand®, GPON, BPON, PCI Express®, and SAS/SATA applications.
The devices's miniature package incorporates thermally managed design techniques specifically targeted for high-current (65 mA to 75 mA, typical), high-frequency (100 MHz and greater), differential-output (LVDS, LVPECL, HCSL) applications. LVDS and LVPECL output options are available for all frequencies except the 100 MHz version. This frequency is generally used in PCI Express applications and is provided with (differential) HCSL output type.
These crystal oscillators are highly competitive against SAW-based oscillator designs, which are manufactured in a larger, 5 mm x 7 mm ceramic package. Offering comparable phase-jitter performance (under 1psRMS), the DS4-XO devices deliver a much higher degree of frequency stability (±40 ppm versus ±100 ppm or greater) over the extended temperature range. Additionally, the series provides extremely low, ±7 ppm aging over 10 years, whereas SAW-based oscillators typically provide ±1 ppm aging per year.
Unlike third-overtone oscillator designs, the DS4-XO oscillators integrate a robust, LC-PLL circuit that uses fundamental AT-cut crystals; therefore, they completely eliminate the spurious modes of operation that result in extreme frequency deviation. Moreover, the PLL-based design easily accommodates operating frequencies up to 622.08 MHz and higher, if desired. In contrast, third-overtone designs provide limited frequency operation with maximum frequencies of approximately 200 MHz. The standard frequencies available are: 77.76 (DS4776), 106.25 (DS4106), 125 (DS4125), 155.52 (DS4155), 156.25 (DS4156), 160 (DS4160), 212.50 (DS4212), 311.04 (DS4311), 312.50 (DS4312), 425 (DS4425), and 622.08 MHz (DS4622).
Data sheets for the
are available on the maxim website.